1. Department of Earth Science and Earth Research Institute University of California Santa Barbara CA USA
2. Scripps Institution of Oceanography University of California San Diego, La Jolla CA USA
3. Department of Physics and Astronomy Brigham Young University Provo UT USA
4. Wilson Alaska Technical Center, Alaska Volcano Observatory, Geophysical Institute University of Alaska Fairbanks Fairbanks Alaska USA
5. Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science Kyoto University Kumamoto Japan